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You want a small gap of 1/8 of an inch between the door and the jamb. However, the gap size depends on the direction the door swings and whether it contains glass. You will also want to aim for the same size gap on all sides of the door, so it opens and closes smoothly.

Most of the time, the direction your door swings does matter. Your door’s swing is also called its handing, and it determines how your door opens. The layout of your home probably only gives your door enough room to hang and swing in one direction. On the other hand, it might not matter if your door can open freely in either direction without inconveniencing you and your household.

You might be able to turn a normal door into a fire-rated door, but you’re better off purchasing one that meets all NFPA 80 standards. If you want to DIY a normal door into a fire door, you’ll need a self-adhesive intumescent seal, metal hinges, fire-resistant glazing, and a self-closing device, but you’re always better off buying a certified fire door.

The vast majority of hinges are symmetrical, and either side of the hinge can go on the door or the frame. Occasionally, you'll find a hinge specifically made for right or left-handed doors with different attachment hardware or larger plates on one side. In most cases, the large side of the hinge goes on the frame.

It is possible to install hinges backward, so be careful when placing them. Position the hinge so that the hinge pin faces the direction the door will swing. For example, if you're standing on the side the door will open into, the pin should be visible. Be extra careful when installing exterior doors, as placing the hinges on the outside for an outward-facing door makes your home much easier to break into.